The rtypmsize() function

When rtypmsize() determines sizes for character data, keep in mind the following size information:

• For CCHARTYPE (char) and CSTRINGTYPE (string), Informix® ESQL/C adds one byte to the number of characters for the null terminator.
• For CFIXCHARTYPE (fixchar), Informix® ESQL/C does not add a null terminator.

This sample program is in the rtypmsize.ec file in the demo directory.

/*
   * rtypmsize.ec *

   This program prepares a select statement on all columns of the
   catalog table. Then it displays the data type of each column and 
   the number of bytes needed to store it in memory.
*/

#include <stdio.h>

EXEC SQL include sqltypes;

#define WARNNOTIFY      1
#define NOWARNNOTIFY    0

EXEC SQL BEGIN DECLARE SECTION;
    char db_name[20];
EXEC SQL END DECLARE SECTION;

main(argc, argv)
int argc;
char *argv[];
{
    mint i;
    char db_stmnt[50];
   int4 exp_chk();
    struct sqlda *sql_desc;
    struct sqlvar_struct *col;

    printf("RTYPMSIZE Sample ESQL Program running.\n\n");

    if (argc > 2)            /* correct no. of args? */
      {
      printf("\nUsage: %s [database]\nIncorrect no. of argument(s)\n",
         argv[0]);
      exit(1);
      }
   strcpy(db_name, "stores7");
    if (argc == 2)
      strcpy(db_name, argv[1]);

   EXEC SQL connect to :db_name;
   sprintf(db_stmnt, "CONNECT TO %s", argv[1]);
   exp_chk(db_stmnt, NOWARNNOTIFY);

   printf("Connected to '%s' database.", db_name);

    EXEC SQL prepare query_1 from 'select * from catalog'; /* prepare select */
    if(exp_chk("Prepare", WARNNOTIFY) == 1)
      exit(1);
    EXEC SQL describe query_1 into sql_desc;           /* setup sqlda */
    if(exp_chk("Describe", WARNNOTIFY) == 1)
      exit(1);
    printf("\n\tColumn              Type    Size\n\n");       /* column hdgs. */
    /*
     * For each column in the catalog table display the column name and
     * the number of bytes needed to store the column in memory.
     */
    for(i = 0, col = sql_desc->sqlvar; i < sql_desc->sqld; i++, col++)
   printf("\t%-20s%-8s%3d\n", col->sqlname, rtypname(col->sqltype),
       rtypmsize(col->sqltype, col->sqllen));

    printf("\nRTYPMSIZE Sample Program over.\n\n");
}

/*
 *  The exp_chk() file contains the exception handling functions to
 *  check the SQLSTATE status variable to see if an error has occurred
 *  following an SQL statement. If a warning or an error has
 *  occurred, exp_chk() executes the GET DIAGNOSTICS statement and
 *  prints the detail for each exception that is returned.
 */
EXEC SQL include exp_chk.ec